Prior to the 1996–97 season, Schneider was a member of the 1996World Cup champion Team USA squad. It was his high point for the season as he suffered a serious groin injury and was lost for the majority of the season, playing only 26 games.[3] He returned to the Leafs from his injury the following season and tallied 37 points in 76 games. He was a contract hold-out as a restricted free agent prior to the 1998–99 season, reportedly seeking a $3.3 million salary with the Maple Leafs. Consequently, a few games into the season, the Maple Leafs traded him to the New York Rangers where he then signed a one-year, $2.75 million contract. Born in Manhattan, Schneider stated his excitement to be playing for his hometown team.[4] In two seasons with the Rangers he accumulated 34, then 30 points.

Schneider was left unprotected in the 2000 NHL Expansion Draft and he was chosen by the Columbus Blue Jackets.[5] However, he was never signed by the Blue Jackets and, less than a month later, Schneider signed with the Los Angeles Kings.[6] In his first season with the Kings, Schneider tallied 51 points in 73 games, his highest total since his 52-point season with the Canadiens in 1993–94. As the Kings played into the second round of the 2001 playoffs, Schneider matched a career-high 9 points in 13 playoff games.

After appearing in his second All-Star Game in 2003, Schneider was dealt at the trade deadline to the Detroit Red Wings for two players and two draft picks. The Kings had shopped Schneider around as he was set to become an unrestricted free agent at the end of the season. With the development of offensive-minded defensemen Joe Corvo and Lubomir Visnovsky, Schneider was considered replaceable by the Kings.[7] Although the Red Wings had traded for Schneider as a rental player to bolster their Stanley Cup run, they were upset in the first round by the Mighty Ducks of Anaheim. Schneider finished the season with 16 goals and 50 points between the Kings and Red Wings.

Schneider was re-signed by Detroit in the off-season to a two-year deal[8] and he eventually played another three seasons with the Red Wings that included a career-high 21 goals and 59 points in 2005–06. He played his 1,000th NHL game against the Anaheim Ducks on October 21 of that same season and scored his 200th NHL goal on March 6, 2007, against the Nashville Predators.[9]

Following the 2006–07 season, Schneider became an unrestricted free agent and he signed a two-year, $11.25 million deal with the Anaheim Ducks. The Ducks had pursued Schneider in lieu of Norris Trophy-winner and team captainScott Niedermayer's expected retirement (although Niedermayer returned to the Ducks later in the season).[10][11] By signing with the Ducks, he missed a chance for another Stanley Cup, arriving in Anaheim the same year that Detroit won the 2008 Stanley Cup championship and a year after the Ducks' 2007 Stanley Cup victory. Schneider did not debut with the Ducks until a couple months into the season, as he sustained a broken ankle in a pre-season game against the Los Angeles Kings.[12] In his only season with the Ducks, he tallied 39 points in 65 games, second among Ducks' defensemen.[13]

As the 2008–09 season approached, the Ducks looked to free up cap space in order to re-sign Teemu Selänne. With All-Star defensemen Chris Pronger and Scott Niedermayer ahead of him on the depth chart, Schneider was placed on waivers, but cleared.[14] The Ducks instead traded him to the Atlanta Thrashers on September 26, 2008, in exchange for three players.[15] However, Schneider did not remain with the Thrashers for the whole season. He was traded back to the Montreal Canadiens in February 2009 for two draft choices.

On August 28, 2009, the Vancouver Canucks signed Schneider to a one-year, $1.55 million contract. The deal included a $1 million signing bonus (making his base salary $550,000), dispersed throughout the season over four equal payments.[16] After having undergone off-season shoulder surgery, Schneider missed the first 10 games of the 2009–10 season and made his Canucks debut on October 25 in a 2–0 win against the Edmonton Oilers.[17] He was playing primarily as a depth defenseman and on December 20, he left the team due to a reported dispute about his playing time. Following his debut for the Canucks, he was a healthy scratch 11 times in 28 games. The Canucks explained his absence as a "personal matter", while general manager Mike Gillis reportedly tried to trade Schneider.[18]

On December 29, 2009, Schneider was waived by the Vancouver Canucks.[19] After clearing waivers, he reported to the Canucks' AHL affiliate, the Manitoba Moose on January 2, 2010.[20] On March 3, 2010, Schneider was traded from the Vancouver Canucks to the Phoenix Coyotes for Sean Zimmerman and a sixth-round draft pick. At the end of 2010, Schneider officially ended his career as a player.[21]

Schneider first played for the United States in the 1988 World Junior Championships, tallying 2 assists as the U.S. finished in sixth place. He made his senior international debut at the 1996 World Cup, where the U.S. won the tournament in a three-game final over Canada. Schneider scored 2 goals in 7 games.

Two years later, in 1998, he was selected to join the U.S. team at the 1998 Winter Olympics in Nagano. He failed to register a point as the U.S. finished a disappointing sixth. A serious groin/abdominal injury kept Schneider from consideration for the 2002 Winter Olympics in Salt Lake City, and, although he was chosen to his second World Cup tournament in 2004, he pulled out of the games due to a lack of insurance (he was not signed to an NHL team that summer).[citation needed]

In December 2005, he was selected to represent the U.S. at the 2006 Winter Olympics in Turin. Despite a two-point performance from Schneider in the quarterfinals, the U.S. was eliminated by Finland.[23]

During his tenure with the Los Angeles Kings, the Schneider Family resided in Manhattan Beach, California. But are currently living in Toronto. Mathieu is married to Shannon Schneider and has four kids Mathieu Jr., Abigail, Micah, and Ella.[24] Schneider was one of a handful Jewish players in the NHL.[24]

October 14, 1998 – Rights traded by the Toronto Maple Leafs to the New York Rangers in exchange for Alexander Karpovtsev and New York's fourth-round draft choice in 1999; signs one-year, $2.75 million contract with the New York Rangers.